In addition to the wheel brakes on most jets and turboprops, the pilots can use reverse thrust to assist in decelerating the airplane.
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As we've discussed above, snow, ice, and bad weather do not hinder a flight. It remains safe to fly as long as precautious and pilot training are both up to date.
“There is not a specific temperature,” says Tom Haines, Senior Vice President of Media, Communications & Outreach at the Aircraft Owners and Pilots Association (AOPA).
“Jet fuel begins to gel in extreme conditions and does eventually freeze, typically at minus 40 or so, although additives can be included that reduce that further,” says Haines. “Aircraft at cruising altitude will often experience temperatures of minus 50 to minus 70 F for hours on end.”
The type of weather that delays and cancels flights is called inclement weather. Inclement weather is categorized as thunderstorms, snowstorms, wind shear, icing, and fog.
In the United States, airlines are not allowed to keep passengers on the tarmac for more than three hours on domestic flights and four hours on international flights without allowing them to disembark. After this time, the airline must either return to the gate or provide alternate transportation.
Ice builds up on aircraft in two ways: in flight or on the ground. On the ground, precipitation falls onto the airplane and freezes on upper surfaces much like what happens if you leave your car out overnight. On planes, ground icing forms on the upper surfaces of the wing and tail.
Fatigue is particularly prevalent among pilots because of unpredictable work hours, long duty periods, circadian disruption, and insufficient sleep. These factors can occur together to produce a combination of sleep deprivation, circadian rhythm effects, and 'time-on task' fatigue.
Rain is just water, no matter the pressure. Modern aircraft can generate lift regardless of the heaviness of the rain. Planes can and will take off and land in the rain. The only real problem with heavy rainfall is the decrease in visibility for the pilots.
Ultimately, it is usually perfectly safe for planes to fly in storms. Today's aircraft, especially big passenger airplanes, are designed to deal with lightning strikes, rain, and other conditions. Plus, pilots haveextensive training in how to handle storms and can be trusted to make the right call.
Can a plane take off in a thunderstorm? Technically, it is possible, but pilots and air traffic experts prefer to keep planes on the ground when a storm is present and wait for it to calm down before setting off.
The decision to cancel a flight due to snowfall is not solely based on the number of inches accumulated. Airports and airlines typically follow specific guidelines that consider various factors, including visibility, runway conditions, and the ability to safely de-ice aircraft.
In the event of an emergency requiring a return to the departure airport, the aircraft circles nearby in order to consume fuel to get down to within the maximum structural landing weight limit, or, if the situation demands, simply land overweight without delay.